Rep. Todd Akin, the Republican nominee for Senate in Missouri who is running against Sen. Claire McCaskill, justified his opposition to abortion rights even in case of rape with a claim that victims of “legitimate rape” have unnamed biological defenses that prevent pregnancy.

“First of all, from what I understand from doctors [pregnancy from rape] is really rare,” Akin told KTVI-TV in an interview postedSunday. “If it’s a legitimate rape, the female body has ways to try to shut that whole thing down.”

Akin said that even in the worst-case scenario — when the supposed natural protections against unwanted pregnancy fail — abortion should still not be a legal option for the rape victim.

“Let’s assume that maybe that didn’t work, or something,” Akin said. “I think there should be some punishment, but the punishment ought to be on the rapist and not attacking the child.”

Video, clipped by the Democratic tracking outfit American Bridge (the full interview is below):

A 1996 studyby the American Journal of Obstetricians and Gynecologists found “rape-related pregnancy occurs with significant frequency” and is “a cause of many unwanted pregnancies” — an estimated “32,101 pregnancies result from rape each year.”

His claim about “legitimate” types of rape is not completely foreign to the current Republican Congress, however. In 2011, the House GOP was forced to drop language from a bill that would have limited federal help to pay for an abortion to only victims of “forcible rape.” Akin was a co-sponsoron the bill.

Nor is this Akin’s first time suggesting some types of rape are more worthy of protections than others. As a state legislator, Akin voted in 1991 for an anti-marital-rape law, but only after questioning whether it might be misused “in a real messy divorce as a tool and a legal weapon to beat up on the husband,” according to a May 1 article that year in the St. Louis Post-Dispatch.

The PollTracker Averageshows Akin leading McCaskill by a margin of 49.7 percent to 41.3 percent.

Below are Akin’s comments in their full context (abortion question begins around the four-minute mark):